$2 .5².3²+{[2.5³ - ( 5x + 4 ) . 5 ] : ( 2² . 3 . 5) } = 453$
$ 450 + {[2.5³ - ( 5x + 4 ) . 5 ] : ( 2² . 3 . 5) } = 453$
${[2.5³ - ( 5x + 4 ) . 5 ] : ( 2² . 3 . 5) } = 453 - 450 $
$[2.5³ - ( 5x + 4 ) . 5 ] : ( 2² . 3 . 5) = 3$
$[250 - ( 5x + 4 ) . 5 ] : 60 = 3$
$250 - ( 5x + 4 ) . 5 = 3 × 60$
$250 - ( 5x + 4 ) . 5 = 180$
$ ( 5x + 4 ) . 5 = 250 - 180 $
$ ( 5x + 4 ) . 5 = 70 $
$5x + 4 = 70 : 5$
$5x + 4 = 14$
$5x = 14 - 4$
$5x = 10$
$x = 10 : 5$
$x = 2 $
⇒ X = 2
